private static IDatasetMatchCriterion TryCreate(
[NotNull] NamedValuesExpression expression,
[NotNull] NotificationCollection notifications)
{
Assert.ArgumentNotNull(expression, nameof(expression));
Assert.ArgumentNotNull(notifications, nameof(notifications));
var simpleExpression = expression as SimpleNamedValuesExpression;
if (simpleExpression != null)
{
return(TryCreate(simpleExpression.NamedValues, notifications));
}
var conjunction = expression as NamedValuesConjunctionExpression;
if (conjunction != null)
{
return(TryCreate(conjunction, notifications));
}
throw new ArgumentException(
string.Format("Unsupported expression type: {0}", expression),
nameof(expression));
}
private bool TryCreateExpression(
[NotNull] string line,
[NotNull] NotificationCollection notifications,
[CanBeNull] out NamedValuesExpression expression)
{
if (line.IndexOf(_conjunctionSeparator, StringComparison.Ordinal) < 0)
{
NamedValues namedValues;
if (TryCreateNamedValues(line, notifications, out namedValues))
{
expression = new SimpleNamedValuesExpression(namedValues);
return(true);
}
expression = null;
return(false);
}
string[] parts = line.Split(new[] { _conjunctionSeparator }, StringSplitOptions.None);
if (parts.Length < 2)
{
NotificationUtils.Add(notifications,
"Invalid position of '{0}' on line '{1}'",
_conjunctionSeparator, line);
expression = null;
return(false);
}
var conjunction = new NamedValuesConjunctionExpression();
var anyFailure = false;
foreach (string part in parts)
{
NamedValues namedValues;
if (TryCreateNamedValues(part, notifications, out namedValues))
{
conjunction.Add(namedValues);
}
else
{
anyFailure = true;
}
}
if (anyFailure)
{
expression = null;
return(false);
}
expression = conjunction;
return(true);
}
